荷莉(Julia Goldani Telles 饰)等女孩到好朋友凯蒂(Annalise Basso 饰)参加过夜聚会,闲聊过程中,他们得知同级的另外几个男孩正密谋召唤瘦长鬼影。瘦长鬼影是流传在民间的一个恐怖传说,据说他长手长脚,看不清面容,专门引诱、绑架小孩子。胆大好奇的女孩们无所畏惧,从网上找来了召唤瘦长鬼影的视频做大胆尝试。是夜相安无事,可就在一周后的课外教学活动中,凯蒂神秘失踪。事后从凯蒂父亲的哭诉中,荷莉隐约感到好友的失踪和她们曾进行过的召唤仪式有关。她们进入凯蒂的房间,查询电脑记录时发现好友在失踪前曾看过许多关于瘦长鬼影的视频。 或许那个传说中的怪物真的存在……When their friend mysteriously disappears, a group of teenage girls explore whether the culprit could be the creepy internet urban legend character Slenderman by summoning him with a ritual. They begin experiencing supernatural phenomena that make them believe the story is real and that they are now being haunted by the Slenderman. Directed by Sylvain White. Based on the character created by Eric "Victor Surge" Knudsen.